He's just asking why the current demo (trial version I'm assuming) is so old. The reason was because core components of the engine were changed to allow for faster updates. Yes, it's been 16 1/2 months since the last release. It now seems that the 6.4 release is right around the corner which means that the trial version will also likely be upgraded as well.

"You level up the fastest and easiest if you do things at your own level and no higher or lower" - useful tip My 2D game - release on Jun 13th; My tutorials